Determining the Natural Frequency of Behbahan City Soil Using Microtremor Data Analysis

جغرافیا و مخاطرات محیطی

Article 11, Volume 12, Issue 4 - Serial Number 48, February 2024, Pages 233-251   

Document Type: Research Article

DOI: 10.22067/geoeh.2023.80563.1326

Authors

Sasan Motaghed^{* 1}; Amin Nakhlian²; Lotfolla Emadali¹; Nasrollah Eftekhari³; Heshmatalla Mahmoudian⁴

¹Assistant Professor in Civil Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

²MSc in Structural Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

³Assistant Professor in Civil Engineering, Yasouj University, Choram, Iran

⁴MSc in Geography, Center of monitoring Assessment and Prediction of Natural Disasters (MAP), Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

Abstract

Soil deformation can have a major impact on the seismic design inputs of structures. In practice, the soil is always bounded by rocks. In this case, the phenomenon of resonance or beating due to the closeness of the frequency of the structure to the natural frequency of the soil can be very destructive. For this reason, the natural frequency of the soil is considered in the construction regulations in presenting the spectral shape. To determine the natural frequency of soil in Behbahan city, the H/V method based on non-destructive measurement of ambient noise, which is a inexpensive and successful method for evaluating soil properties, was used. After recording microtremor data in 69 stations, H/V analysis was done to estimate the resonance frequency at the points. Then, natural frequency maps of the soil were presented. The results showed that the natural frequency range of soil in Behbahan city is between 0.57 and 5.42 Hz. Therefore, this soil is included in soil types 2 and 3 (standard No. 2800). Moreover, based on the construction information, a resonance-prone areas map was provided. In the central areas, the soil type is mainly type 3. Most of the buildings in this area are low codes, so it requires more precision in future developments. In the northwest and southeast of the city, the period of soil resonance is more than one second; therefore, in the construction of tall buildings in these areas, more strict measures should be taken into account to control the structures.

Keywords

GIS; Local Site Effects; Soil Type; Resonance; H/V Analysis

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